SLM21814 High-voltage High-speed power MOSFET and IGBT Driver
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SLM21814 High-Voltage MOSFET / IGBT Driver | 600V Half-Bridge Driver with Bootstrap
The SLM21814 is a high-voltage, high-speed MOSFET / IGBT half-bridge driver with independent high-side and low-side output channels. The floating channel is designed for bootstrap operation up to 600V, making it a workhorse driver for PSU half-bridge / full-bridge topologies, motor control, and high-power inverter applications.
Key features: gate-drive supply 10V-20V, undervoltage lockout (UVLO) for both channels, 3.3V and 5V logic-compatible inputs, CMOS Schmitt-trigger input with pull-down, matched propagation delay across both channels, output in phase with input. High pulse-current buffer stage minimizes cross-conduction; latch-immune CMOS construction handles negative transients and high dV/dt.
When to Replace the SLM21814
- PSU half-bridge stage stops switching — gate-drive signals dead at both high-side and low-side MOSFET gates.
- One channel asymmetric / weak — driver partially failed, switching imbalance burns the MOSFETs over time.
- Visible damage on the driver chip — burnt or cracked package.
- UVLO trip cascade — driver mis-reporting supply voltage.
SLM21814 Specifications
| Parameter | Specification |
|---|---|
| Type | Half-bridge MOSFET / IGBT Gate Driver |
| Maximum Floating Channel Voltage | +600V |
| Gate Drive Supply Range | 10V to 20V |
| Logic Compatibility | 3.3V and 5V |
| Channel Architecture | Independent high-side + low-side, floating channel for bootstrap |
| Protections | Undervoltage lockout (both channels) |
| Input | CMOS Schmitt-trigger with pull-down |
| Output | In phase with input |
| Construction | Latch-immune CMOS, monolithic HVIC |
| Compliance | RoHS |
FAQ — SLM21814 Driver IC
Q: How do I confirm the driver is the failed part?
A: Probe the high-side and low-side gate-drive output pins with a 100MHz scope while the PSU controller is trying to start. A healthy driver produces clean rail-to-rail square waves matching the controller's PWM input. No output, stuck-high / stuck-low, or asymmetric channels = failed driver.
Q: VCC range — is the 10-20V critical?
A: Yes. The driver needs at least 10V VCC for the low-side gate drive to be in a safe operating range; below this the UVLO trips. Above 20V you risk damage. Match the original PSU's gate-drive supply rail.
Q: Rework profile?
A: Most SLM21814 variants ship in SOP-14 or DIP-14. Match the package on your board. Hot-air SMD rework at 320°C for the SOP-14; through-hole desoldering for DIP-14.
Q: Bulk pricing?
A: Yes — email contact@lys-sz.com for tray-quantity pricing.
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PSU repair benches stocking SLM21814 gate drivers in volume? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.
Buying in bulk for a mining farm or repair shop?
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